index.css

html {
    background: gray;
    height: 100%;
}

body {
    color: white;
    font-family: 'Trebuchet MS', 'Helvetica', 'Arial', sans-serif;
    text-transform: uppercase;
    height: 100%;
    margin: 0;
}

.flexbox {
    display: flex;
}
.flexbox > * {
    text-align: center;
    flex: 1;
}

h1 {
    margin: 12px 6px;
}

a {
    color: white;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

canvas {
    image-rendering: crisp-edges;
    image-rendering: pixelated;
    cursor: crosshair;
}

input[type='radio'],
input[type='checkbox'],
input[type='file'],
input[type='button'] {
    display: none;
}

input:disabled {
    visibility: hidden;
}

input + label {
    cursor: pointer;
}
input.option + label {
    padding: 6px;
    opacity: 0.5;
    display: inline-block;
}
input.option + label:hover {
    opacity: 0.75;
}
input.option:checked + label {
    font-weight: bold;
    opacity: 1;
}

input.option.text + label:before {
    content: '';
    background-image: url(icon/CheckmarkBad.png);
    background-size: 18px;
    width: 18px;
    height: 18px;
    vertical-align: bottom;
    display: inline-block;
}
input.option.text:checked + label:before {
    background-image: url(icon/CheckmarkGood.png);
}

input + label img {
    display: block;
}

.hidden {
    display: none;
}

.wrapper {
    width: 100%;
    height: 100%;
}

.section {
    position: relative;
    overflow-y: scroll;
}

#left {
    background:
        linear-gradient(45deg, gray 25%, transparent 25% 75%, gray 75%) 0 0,
        linear-gradient(45deg, gray 25%, darkgray 25% 75%, gray 75%) 10px 10px;
    background-size: 20px 20px;
}
#left.solid {
    background: none;
}

#basic {
    background: linear-gradient(#1b2a41, #0f1824);
    width: 100%;
    border-bottom: 3px double #ccb55a;
    margin-bottom: 12px;
}

#version {
    font-size: 12px;
    margin: 6px;
    display: block;
    flex: none;
}

#kofi {
    flex: none;
}

#kofi img {
    width: 24px;
    margin: 6px;
}

#basic img {
    vertical-align: middle;
}

#custom-selection label img {
    background: #1b2a41;
    box-shadow: 0 0 0 5px #1b2a41;
    border-radius: 50%;
}

.button-container {
    padding: 8px;
}
.button-container > *,
#tap-download:checked + label {
    background: #ccb55a;
    color: black;
    font-weight: bold;
    display: inline-block;
    padding: 6px;
    border: 3px double #1b2a41;
    cursor: pointer;
}
.button-container > *:hover {
    background: #dec974;
}

#tap-download + label {
    background: #1b2a41;
    color: gray;
    border: 3px double gray;
    opacity: 1;
}

#outlink {
    line-height: 32px;
    display: inline;
}

#outlink img {
    height: 32px;
    vertical-align: bottom;
}

#right {
    background: linear-gradient(#1b2a41, #0f1824);
    border-left: 3px double #ccb55a;
    flex: none;
    display: flex;
    flex-direction: column;
}

#right > * {
    flex: none;
}

#iro {
    padding: 0 6px;
}

.disabled {
    opacity: 0.25;
    pointer-events: none;
}

#palette {
    flex: 1;
    overflow-y: scroll;
}

#palette input[type='radio'] + label {
    display: block;
    padding: 3px;
    border-radius: 3px;
    cursor: default;
}
#palette input[type='radio'] + label:hover {
    box-shadow: inset 0 0 6px white;
}
#palette input[type='radio']:checked + label {
    box-shadow: inset 0 0 3px 3px white;
}
#palette input[type='radio'].hidden + label {
    display: none;
}

#palette input[type='radio'] + label:before {
    content: attr(data-n);
    width: 16px;
    height: 16px;
    color: white;
    font-size: 8px;
    line-height: 16px;
    vertical-align: middle;
    display: inline-block;
    border: 1px solid white;
    border-radius: 50%;
    margin: 3px;
}

#palette input[type='radio'] + label > * {
    vertical-align: middle;
    margin: 3px;
}

#palette input[type='color'] {
    background: transparent;
    width: 24px;
    height: 24px;
    padding: 0;
    border: none;
}

#palette input[type='text'] {
    background: none;
    color: white;
    font-family: 'Andale Mono', 'Lucida Console', 'Courier New', 'Courier', monospace;
    font-size: 18px;
    text-transform: uppercase;
    width: 9em;
    border-width: 0 0 1px 0;
}

#palette .chowder {
    background: black;
    background-size: 200%;
    width: 24px;
    height: 24px;
    display: inline-block;
    outline: 1px solid white;
    cursor: pointer;
}
#palette .chowder[data-value='1'] {
    background-image: url(texture/Space.png);
}
#palette .chowder[data-value='2'] {
    background-image: url(texture/fire.png);
}
#palette .chowder[data-value='3'] {
    background-image: url(texture/water.png);
}
#palette .chowder[data-value='4'] {
    background-image: url(texture/killarainbow.png);
}
#palette .chowder[data-value='5'] {
    background-image: url(texture/umbrella_veins.png);
}
#palette .chowder[data-value='6'] {
    background-image: url(texture/bunny_fishnet.png);
}

#palette input[type='checkbox'] + label {
    background: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: inline-block;
}
#palette input[type='checkbox']:checked + label {
    background: radial-gradient(white, transparent 75%);
}